Field-validated Mg-biochar balls: In-situ nutrient recovery from Paddy runoff and compost enhancement for economic benefits
文献类型： 外文期刊
作者： Lu, Xinyue 1 ; Wang, Lisha 1 ; Sun, Xiaolong 3 ; Guo, Wenjing 1 ; Sha, Aiguo 4 ; Feng, Yuanyuan 5 ; Feng, Yanfang 1 ; Xue, Lihong 1 ;
作者机构： 1.Jiangsu Acad Agr Sci, Minist Agr & Rural Affairs, Natl Liuhe Observ,Inst Agr Resources & Environm, Key Lab Agr Environm Lower Reaches Yangtze River, Nanjing 210014, Peoples R China
2.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, 163 Xianlin Ave, Nanjing 210023, Peoples R China
3.Jiangsu Acad Agr Sci, Agr Econ Res Inst, Nanjing 210014, Peoples R China
4.Jiangsu Aiyuan Hlth Technol Co Ltd, 6 Guyang Rd, Zhenjiang 212003, Jiangsu, Peoples R China
5.Nanjing Forestry Univ, Coll Forestry & Grassland, Coll Soil & Water Conservat, Nanjing 210037, Peoples R China
关键词： Resource recovery; Field-validated trial; Metal-modified biochar balls; Aerobic composting; Economic benefits
期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）
ISSN： 1385-8947
年卷期： 2025 年 520 卷
页码：
收录情况： SCI
摘要： Nitrogen and phosphorus are essential nutrients for all living organisms; however, excessive application of fertilizers has led to significant agricultural non-point source pollution. The recovery of these nutrients is critically important, particularly in light of the global scarcity of phosphorus resources. Hence, this study presents field-validated Mg-biochar balls (Mg-BCB) for in-situ nutrient recovery from paddy runoff and compost-driven economic gains. Biochar powder prepared by co-precipitation of MgCl2 and KOH was granulated into Mg biochar balls (Mg-BCB), Mg-BCB demonstrated efficient NH4+(20-27 %), NO3- (37-41 %), and total phosphorus (TP, 33-50 %) removal via ligand binding and surface precipitation in farmland ditches. The nitrogen and phosphorus saturated Mg-BCB (Mg-BCB-N/P) was repurposed as a composting additive, increasing total nutrient content by 30.82 % through lowered pH and higher composting temperatures to enhance microbial activity. Simulation analysis suggested Mg-BCB could recover 62 % of exogenous N/P inputs in Taihu Lake basin, projecting environmental economic profits of 206.35 RMB t-1 of Mg-BCB, with Yixing City estimated to attain 2.81 x 106 RMB annual benefits. The closed-loop strategy not only mitigates eutrophication but also converts non-points source pollutants into agricultural resources, addressing phosphorus scarcity while delivering scalable economic returns.
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